JP3790001B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention eliminates steam that can be trapped with moyamo by condensing the steam remaining as a heat source in various steam-using devices and re-evaporated steam generated from high-temperature drain by heat exchange with a cooling fluid such as water. It is related with the heat exchanger which can.
[0002]
[Prior art]
A conventional heat exchanger of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 60-120186. This is because a cooling pipe is installed in a heat recovery chamber having a steam supply port, an atmosphere opening portion is communicated with the heat recovery chamber, and condensate is stored in the atmosphere opening portion and the lower portion of the heat recovery chamber, It is possible to prevent heat from flowing into the heat recovery chamber and efficiently exchange heat.
[0003]
[Problems to be solved by the invention]
The conventional heat exchanger has a problem that a large amount of cooling water is required to completely condense the steam. In other words, since the supplied steam only exchanges heat with the cooling pipe in the heat recovery chamber, when it is necessary to completely condense a large amount of steam, such as when it is desired to eliminate the state of confusion with the steam. A large amount of cooling water is required.
[0004]
Therefore, the technical problem of the present invention is to obtain a heat exchanger capable of reliably condensing steam without requiring a large amount of cooling fluid.
[0005]
[Means for Solving the Problems]
Means taken in order to solve the above-mentioned problem is to supply a cooling fluid to the heat exchange container and condense the steam by exchanging the steam in the container with the cooling fluid. , Connect the compressed air source to the nozzle part of the ejector, connect the cooling fluid supply pipe to the suction part of the ejector, and place the diffuser part of the ejector in the heat exchange container to pass through the nozzle part The compressed air is adiabatically expanded to lower the temperature and mixed with the cooling fluid .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
By connecting a compressed air source to the nozzle part of the ejector and connecting a cooling flow supply pipe to the suction part, a suction force is generated in the suction part by the compressed air passing through the nozzle part, and the cooling fluid is sucked. The cooling fluid is mixed and supplied from the diffuser to the heat exchange vessel.
[0007]
The compressed air that passes through the nozzle portion and reaches the heat exchange vessel is adiabatically expanded by reducing the pressure from the high pressure state before supply to the low pressure state in the heat exchange vessel. The cooling fluid mixed by the adiabatic expansion is deprived of heat and becomes a lower temperature state, and is supplied from the diffuser portion into the heat exchange vessel, thereby rapidly cooling and condensing the vapor in the heat exchange vessel. Therefore, compared with a conventional heat exchanger in which heat is only exchanged in the cooling pipe, the condensation of the vapor proceeds at a rate at which the compressed air adiabatically expands and cools the cooling fluid, and the vapor is reduced with less cooling fluid. Can be reliably condensed.
[0008]
【Example】
In FIG. 1, a heat exchange container 1, a steam supply pipe 2 that supplies steam to be condensed, an ejector 3 attached to the heat exchange container 1, a compressed air supply pipe 4 connected to the ejector 3, and a cooling fluid supply pipe 5. Construct a heat exchanger.
[0009]
The compressed air supply pipe 4 is connected to a compressed air supply source (not shown) and is connected to the nozzle portion 7 of the ejector 3 through a valve 6. The nozzle portion 7 has a throttle portion built in, and a suction port 8 of the suction portion is provided on the outer periphery thereof. A cooling fluid supply pipe 5 is connected to the suction port 8 via a valve 9.
[0010]
A diffuser unit 10 is provided below the nozzle unit 7 and attached to the upper opening 11 of the heat exchange vessel 1. A dispersion plate 12 that disperses the mixed fluid of compressed air and cooling fluid over almost the entire interior of the heat exchange container 1 is attached to the lower part of the diffuser unit 10 and above the heat exchange container 1. The dispersion plate 12 has a substantially conical shape and is provided with a plurality of communication holes 13.
[0011]
The steam supply pipe 2 is connected to an outlet side of a steam using apparatus (not shown), a re-evaporation tank or the like, and supplies steam into the heat exchange container 1 for condensation. An exclusion pipe 15 is connected to the lower end of the heat exchange vessel 1 to remove the condensed vapor and cooling fluid to a predetermined location.
[0012]
The compressed air supplied from the compressed air supply pipe 4 is squeezed by the nozzle portion 7 of the ejector 3 to increase the flow velocity, generate a suction force, suck the cooling fluid from the suction port 8, and mix into the heat exchange container 1. Supplied. In this case, the cooling fluid is further cooled and mixed with the compressed air by adiabatic expansion of the compressed air. The mixed fluid of the compressed air and the cooling fluid is supplied by the dispersion plate 12 so as to spread throughout the heat exchange vessel 1. The supplied mixed fluid exchanges heat with the steam filled in the heat exchange container 1, condenses the steam, and is discharged from the lower end exclusion pipe 15 to a predetermined location.
[0013]
In the present embodiment, an example of a direct heat exchanger that directly supplies steam to be condensed in the heat exchange vessel 1 and exchanges heat with a fluid mixture with a cooling fluid has been shown. It can also be used for an indirect heat exchanger in which the outer surface of the copper tube is exchanged with a mixed fluid by flowing down into the pipe.
[0014]
In the present embodiment, an example in which one ejector 3 is arranged in the heat exchange container 1 is shown. However, the number of ejectors is one according to the size of the heat exchange container 1 and the supply amount of steam to be condensed. There is no limitation, and a plurality of two or more units can be arranged.
[0015]
【The invention's effect】
According to the present invention, the cooling fluid can be supplied into the heat exchange vessel at a lower temperature by adiabatic expansion of the compressed air, and the steam can be reliably condensed with less cooling fluid.
[0016]
In addition, not only the cooling fluid but also the compressed air that has been adiabatically expanded and lowered in temperature is mixed and supplied from the diffuser portion of the ejector, and the steam in the heat exchange vessel can be more reliably condensed. .
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a heat exchanger of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat exchange container 2 Steam supply pipe 3 Ejector 4 Compressed air supply pipe 5 Cooling fluid supply pipe 7 Nozzle part 8 Suction port 10 Diffuser 12 Dispersion plate

Claims (1)

A cooling fluid is supplied to a heat exchange container, and the steam in the container is condensed with the cooling fluid to condense the steam. An ejector is attached to the heat exchange container, and a compressed air source is connected to the nozzle portion of the ejector. The cooling fluid supply pipe is connected to the suction part of the ejector, and the diffuser part of the ejector is disposed in the heat exchange container, so that the compressed air that has passed through the nozzle part is adiabatically expanded to lower the temperature and the cooling fluid. A heat exchanger that is mixed .

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